The three piece suit. That extra piece just emphasizes the man's torso like no other. It seems to constrain it, but it also provides tantalizing previews...
Suits make men look their best, of course, but the tuxedo is the pinnacle of manly dress-up. And while many people can't wait to see what's beneath, this is exactly what any man I want would look like both before, and after sex (and during!).